The precious marriage gift in japan is

Options

A. Spongilla
B. Hyalonema
C. Leucosolenia
D. Euplectella

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the precious marriage gift in Japan. We have four options to evaluate.

2. **Evaluating Option 1 - Spongilla**:
- Spongilla are freshwater sponges found in lakes and slow-moving water bodies.
- They filter water for small aquatic organisms and are not associated with marriage gifts.
- **Conclusion**: This option is incorrect.

3. **Evaluating Option 2 - Hyaluronema**:
- Hyaluronema are marine sponges characterized by their porous body and can grow quite deep in water.
- They do not have any cultural significance as a marriage gift in Japan.
- **Conclusion**: This option is also incorrect.

4. **Evaluating Option 3 - Leucosolenia**:
- Leucosolenia are calcareous sponges made of calcium carbonate and are found in pools.
- Similar to the previous options, they do not serve as a marriage gift.
- **Conclusion**: This option is incorrect as well.

5. **Evaluating Option 4 - Euplectella (Venus Flower Basket)**:
- Euplectella, commonly known as the Venus Flower Basket, is a marine sponge with a skeleton made of siliceous spicules.
- It is known for its symbiotic relationship with shrimps, which live inside it and symbolize eternal love.
- When the shrimps die, the basket is given to newlyweds as a symbol of their commitment, representing "till death do us part."
- **Conclusion**: This option is correct.

6. **Final Answer**: The precious marriage gift in Japan is **Euplectella**, commonly known as the **Venus Flower Basket**.